tekmar sensor ???? (leo g)

leo g_13

the universal sensor 071 can be used as an indoor temp sensor?

leo g

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Kal Row

all the tkemar sensors are the same..

and interchangeable - the difference is just in the mount

they at called 10k sensors since they equal about 10k ohms at 72-3 degrees

see
http://www.tekmarcontrols.com/acrobat/d002.pdf
http://www.tekmarcontrols.com/acrobat/d070.pdf
http://www.tekmarcontrols.com/acrobat/d074.pdf

Scott25

others

I have also used other manuf. thermistors (sp) if the profile of the 071 is to big. As long as it is a 10K and the charts of resistance match, anyone of them should work. I dont know how Tekmar feels about that????

Glen

Tekmar

Any 10K thermister should work - when in doubt I phone Kim or Roy (Mech system 2000) in Calgary - but your local dealler should know this as well.

Jay_5

tekmar sensors

All 10K sensors are not the same. There are different types of 10K sensors which change resistance at different rates. The only point at which the different types are the same is at 10, 000 ohms. Using the wrong type of 10K sensor will lead to inaccurate temperature readings, especially when the temperature is much colder or much warmer than 77F.

Duncan_13

Sensor characteristics.

Agreed, and thanks, Jay.

I remember that exact question of sensor characteristics and substitution being asked at a Tekmar training.

Greg, the instructor, pointed out that there are several things to look at in sensors, the critical aspect being an alpha characteristic. I don't recall what that is, but Greg got that info directly from a Tekmar engineer.

The beauty of thermistors is that a small temperature change gives a fairly large resistance change, which means pretty good accuracy. But temp/resistance curves aren't exactly linear. So like others said, if you substitute, an exact curve match would be essential for a given device. If there were problems, what do you think happens to the warranty?

Also, we're talking here about NTC (negative temperature coefficient) thermistors whose resistance increases as temperature decreases. There are also positive temperature coefficient thermistors.

Josh M.

Really any temp sensor that gives the same resistance across the terminals as tekmar will work. Just as long as the values are the same for all temps. I actually put this theory to work one time when I was in a pinch and it works.